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Amazon has once again tweaked the spheres at the center of its proposed downtown Seattle campus.

"The structural system of the Spheres has continued to evolve to be both more elegant and efficient," according to the latest design plan, prepared for an Oct. 22 design review meeting. "The integration of the structural and glazing system maintains a faceted enclosure supported by a freestanding interior modular structure. ...

"When compared to the previously presented design, the overall effect of the current catalan module is visually lighter, and geometrically organic and sculptural."

The plan says the design "will continue to evolve and the actual design of the structural module may be varied."

The latest plan also includes more details about retail entries and the latest look of the base of the proposed office tower, and some changes to driveways.

Amazon is seeking to deviate from design rules by having up to 95 feet of unchanging facade where the rules allow 80 feet; building facade width of 155 feet between floors 18 and 25, where the rules allow 145 feet; and loading berths that are smaller than requirements (they get a lot of UPS vans).